Check out the video from Common Craft to find out what Social Bookmarking is all about

Social Bookmarking in Plain English

Two of the most widely used social bookmarking tools are Delicious (formerly deli.ci.ous) and Diigo.

Delicious

Rena's Delicious site --
http://delicious.com/rdlib

Diigo.com
Take a tourof Diigo, and see what it does that Delicious doesn't. There are three videos on the tour -- click on the Research, Share and Collaborate buttons to see them.

Group Media 21 Student Group Diigo bookmarks
http://groups.diigo.com/group/media-21-student-group
Bookmarks gathered and shared by students and teachers participating in the Media 21 Project at